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05 October 2022 AdvancedGeo <br /> Project No. 95-0184 An Employee-Owned Company <br /> Page 3of3 <br /> Sealed and labeled samples will be placed in a chilled container under ice and transported <br /> under chain-of-custody procedure to a California Environmental Laboratory Accreditation <br /> (CELAP)-certified laboratory. Soil samples selected for laboratory analysis will be <br /> analyzed for the constituents listed in Section 2.2. Each sample will be labeled with boring <br /> designation, depth, time, date, and sampler's initials. Soils encountered in the borings will <br /> be visually classified by AGI personnel in accordance with the Unified Soil Classification <br /> System (USCS). Additionally, soil samples will be field-screened for the presence of <br /> volatile organic compounds using a photo-ionization detector (PID) calibrated to <br /> isobutylene. <br /> 3.2. GRAB GROUNDWATER SAMPLING <br /> For collection of grab groundwater samples, soil borings will be advanced to the top of <br /> the groundwater table as identified by collection of a saturated soil sample. Once <br /> groundwater has been encountered, a Geoprobe (or similar) push-driven water sampling <br /> device will be advanced four feet into the water-bearing zone. Grab groundwater samples <br /> will be collected using a Geoprobe water sampling assembly fitted with a pre-cleaned, <br /> one-inch diameter 0.01-slotted temporary well screen. Each groundwater sample will be <br /> extracted by dedicated disposable polyethylene tubing through the hollow center of the <br /> push rods into the screen section. Samples will be analyzed for the constituents listed in <br /> Section 2.2. and will be collected into laboratory-supplied, non-preserved amber liters and <br /> preserved 40-ml Volatile Organic Analysis (VOA) vials. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedure to a CELAP-certified laboratory. Each <br /> sample container will be labeled with sample designation, time, date and sampler's <br /> initials. <br /> 3.3. EQUIPMENT DECONTAMINATION <br /> Prior to use, all sampling tools used for sample collection will be thoroughly rinsed with <br /> clean water after being washed with a solution of Alconox. All probe tooling and rods will <br /> be cleaned prior to advancement at each probe boring location. <br /> 3.4. BORING ABANDONMENT <br /> All soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. Soil borings shall be abandoned by backfilling with cement grout from the <br /> total depth to surface grade. The top three to six inches of the boring abandonments will <br /> be completed flush to surface grade with native soils or concrete. The SJCEHD will be <br /> notified for grout inspection at least five days prior to conducting grouting procedures. <br />